Single Dish Imaging

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8.4 Single Dish Imaging

Single dish imaging is supported within CASA using standard tasks and tools. The data must be in the Measurement Set format. Once there, you can use the im (imager) tool to create images:

Tool example:

  scans.save(’outputms’,’MS2’)                    # Save your data from ASAP into an MS

  im.open(’outputms’)                             # open the data set
  im.selectvis(nchan=901,start=30,step=1,         # choose a subset of the data
     spwid=0,field=0)                             # (just the key emission channels)
  dir=’J2000 17:18:29 +59.31.23’                  # set map center
  im.defineimage(nx=150,cellx=’1.5arcmin’,        # define image parameters
     phasecenter=dir,mode=’channel’,start=30,     # (note it assumes symmetry if ny,celly
     nchan=901,step=1)                            #  aren’t specified)

  im.setoptions(ftmachine=’sd’,cache=1000000000)  # choose SD gridding
  im.setsdoptions(convsupport=4)                  # use this many pixels to support the
                                                  # gridding function used
                                                  # (default=prolate spheroidal wave function)
  im.makeimage(type=’singledish’,                 # make the image
     image=’FLS3a_HI.image’)

8.4.1 Single Dish Imaging Use Case With ASAP Toolkit

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